Updated mediawiki/extensions
Project: mediawiki/extensions/OpenID  eca24c49eedcac864daec4b3733abddbe98a34c8
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Ensure $sreg and $ax aren't null to prevent array_key_exists warnings.

If either of those are null then warnings are generated:
PHP Warning:  array_key_exists() expects parameter 2 to be array, null given

Change-Id: Ia06484fd7534e3741a5356174d3576a01fa61599